Andromeda Galaxy

AGB Stars in Andromeda M31

The Andromeda galaxy (or M31) is the nearest large spiral galaxy to our Milky Way. M31 has been covered completely by Spitzer, and recently, a third of the galaxy was also covered by the Hubble Space Telescope by the Panchromatic Hubble Andromeda Treasury (PHAT) program.

The PHAT program observed M31 in unprecedented detail. I'm working on combining the PHAT Hubble data with data at other wavelengths to study carbon stars.

Spitzer image of M31, adapted from Boyer et al. (2013).
Blue is 3.6μm, green is 5.8μm, and red is 24 μm.